0002133378-26-000001.txt : 20260806 0002133378-26-000001.hdr.sgml : 20260806 20260806172721 ACCESSION NUMBER: 0002133378-26-000001 CONFORMED SUBMISSION TYPE: D PUBLIC DOCUMENT COUNT: 1 ITEM INFORMATION: Rule 506(b) provides a "safer harbor" for a private offering ITEM INFORMATION: Investment Company Act Section 3(c) ITEM INFORMATION: Section 3(c)(7) FILED AS OF DATE: 20260806 DATE AS OF CHANGE: 20260806 EFFECTIVENESS DATE: 20260806 FILER: COMPANY DATA: COMPANY CONFORMED NAME: West Street Mezzanine Partners IX LP CENTRAL INDEX KEY: 0002133378 ORGANIZATION NAME: EIN: 000000000 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: D SEC ACT: 1933 Act SEC FILE NUMBER: 021-593414 FILM NUMBER: 261250538 BUSINESS ADDRESS: STREET 1: 200 WEST STREET CITY: NEW YORK STATE: NY ZIP: 10282-2198 BUSINESS PHONE: 212-902-1000 MAIL ADDRESS: STREET 1: 200 WEST STREET CITY: NEW YORK STATE: NY ZIP: 10282-2198 D 1 primary_doc.xml X0708 D LIVE 0002133378 West Street Mezzanine Partners IX LP 200 WEST STREET NEW YORK NY NEW YORK 10282-2198 212-902-1000 DELAWARE None None Limited Partnership true 2025 Coleen Gasiewski c/o Maples Fiduciary Svcs. (DE) Inc. 4001 Kennett Pike, Suite 302 Wilmington DE DELAWARE 19807 Director Director of the Issuer's General Partner Stephane Lachance Maples Fiduciary Services (Cayman) Ltd. Ugland House, PO Box 309 Grand Cayman E9 CAYMAN ISLANDS KY1-1104 Director Director of the Issuer's General Partner Paul Bothner c/o Maples Fiduciary Svcs. (DE) Inc. 4001 Kennett Pike, Suite 302 Wilmington DE DELAWARE 19807 Director Director of the Issuer's General Partner Pooled Investment Fund Other Investment Fund false Decline to Disclose 06b 3C 3C.7 false 2026-07-20 true true false 0 Goldman Sachs & Co. LLC 361 None None 200 West Street New York NY NEW YORK 10282-2198 All States false Indefinite 175000000 Indefinite The aggregate amount sold by the Issuer's family of funds is approx. $1.611 billion (including sales pursuant to Regulation S as well as investable capital from GS and employees alongside the Issuer, and excluding asset leverage). false 3 0 0 0 false West Street Mezzanine Partners IX LP /s/ Coleen Gasiewski Coleen Gasiewski Director of the Issuer's General Partner 2026-08-05